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JPL Small-Body Database Browser
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91505 (1999 RA158)
Classification: Main-belt Asteroid          SPK-ID: 2091505
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1718978458428849 3.5795e-08  
a 2.647077762766357 1.398e-08 au
q 2.192050797568217 9.4074e-08 au
i 13.2099639814892 4.5753e-06 deg
node 356.9182012778987 1.8694e-05 deg
peri 53.7361693978734 2.3548e-05 deg
M 243.8134660523818 1.536e-05 deg
tp 2459508.193697072083
(2021-Oct-20.69369707)
6.868e-05 TDB
period 1573.07154913796
4.31
1.2462e-05
3.412e-08
d
yr
n .2288516375477513 1.813e-09 deg/d
Q 3.102104727964497 1.6384e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1106  
   data-arc span      9568 days (26.20 yr)  
   first obs. used      1993-04-18  
   last obs. used      2019-06-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4718  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 22:32:20  

Additional Information
 Earth MOID = 1.22771 au 
 Jupiter MOID = 2.447 au 
 T_jup = 3.334 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.1   n/a MPO385379  
diameter diameter 4.572 km 0.333 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 5.52 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Behrend, R. (2012) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.233   0.066 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

91505 (1999 RA158)          Discovered 1999-Sep-09 by LINEAR at Socorro
Reference: 20041028/Numbers.arcLast Updated: 2004-10-29

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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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